Synthesis of Heterocycles Based on α,β-Unsaturated P(III) Derivatives

A general method of phosphorus heterocycle synthesis has been developed. It is based on the interaction between α,β-ethylene, acetylene P(III) derivatives and reagents, which contain electrophilic and nucleophilic centres in α,β- and α,β-positions, e.g. compounds with activated multiple bonds; β-halogenalcanols and thiols; nitrilimines, nitrilylides as 1,3-dipoles. This process is an unsynchron-ic ionic cycloaddition which begins with the attack of a phosphorus atom to the electrophilic centre of a reagent.